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Old 24-01-2022, 07:10 AM
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RyanJones is offline
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 1,395
Nice work Stephane. Your star field looks nicely corrected in this one. The halos are often cause by reflections in your imaging train. This can be the your filter or coma corrector or something like that. The light of the bright star bounces back and forth meaning the reflected light is out of focus when it reaches the sensor causing a halo around the star. They always become more pronounced when you are forced to stretch the image excessively. You can experiment by trying to move your filter either closer or further away from your sensor and see if that changes things or take some subs without your coma corrector of a bright star in the middle of you optical axis and see what changes that makes. Maybe try a few subs without the filter altogether and see if that eliminates it. Once you know what it is thatís causing it you can decide if you can or want to worry about it.


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